Gas and air mixing meter.



G. R. GOTTRELL. GAS AND Am MIXING METER.

APPLIOATIOH FILED DEC. 6, 1911. LQQQAG3Q Patented Oct. 29, 1912.

2 SHEETS-SHEET 1 INVENTOR now? G. R. GOTTRELL. GAS AND AIR MIXING METER.

APPLICATION FILED DEC. 6, 1911.

Patented Oct. 29, 1912.

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COITRELL, OF ANGLESEA, NEW JERSEY.

GAS AND AIR MIXING METER.

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Specification of Letters Patent.

PatentedOct. 29,1912

Application filed December 6, 1911. Serial No. 684,164.

To (4M whom it may concern:

Be it known that I, GEORGE E. CoTTnnLL, a citizen of the United States,residing at Anglesea, in the county of Cape May and State of New Jersey,have invented certain new and useful Improvements in Gas and Air MixingMeters, of which the following is a specification.

This invention relates to gas and airniixing meters, in which anair-measuring drum is driven or revolved by the pressure of gas passingthrough, and revolving, a gas-measuring drum, for mixing gas and air indefinite and constant proportions, at a uniform velocity and pressure,whereby perfect combustion of the mixture may be produced at theburners.

The object of my invention is to provide a mixing meter in which thescrew-measuring compartment of the gas and air drums have divergingwalls and are of an increasing cross from. the contracted inlet openingtoward the middle portions, and converging walls beyond the middleportions to contracted outlet openings, whereby the currents ofintlowing in the gas drum will impinge with the greatest pressure andefficiency upon of any two compartments open above the Water line, forcausing tne'drum to revolve and thereby cause the air drum to revolvefor measuring and mixing gas and air in velocity and pressure.

The relative capacities of the measuring compartments of the air and thegas drum in the example illustrated are such that the air drum will takein and discharge approximately five volumes of air while the gas drumtakes in and discharges one volume of gas, thereby forming a mixturecontaining six volumes of combustible fluid. The gas and air, in theirrespective volumes, are discharged simultaneously at the same velocityinto a mixing chamber between the adjacent ends of the drums, so that anintimate mixture is produced, and this mixture is discharged into theoutlet pipe under approximately the same pressure as the initialpressure of gas at the intake of the gas drum. The pressure isconstantly maintained during the revolution of the drums and while themixture is flowing to the burners.

The matter constituting my invention herein will be defined in theclaims.

I will now describe th 1 the diverging walls of con struction of myimproved gas and air mixing apparatus by reference to the accompanyingdrawings, in which- Figure 1 represents a vertical longitudinal sectionthrough the casing, the drums and the vanes of the gas drum. Fig. 2represents a vertical transverse section on lines 2-2, Fig. 1, with apart in elevation. Fig. 3 represents a partial end elevation of theouter casing. Fig. i represents a diagrammatic view of the air drumshowing the screw vanes as though laid out in plan and presenting anedge view, for showing the planes. Fig. 5 represents a similar view ofthe gas drum with its vanes.and planes forming the screw measuringcompartments.

The outer cylinder casing is preferably composed of two semi-cylindricalparts A, A, having flanges a, by means of which they are boltedtogether, as indicated in Fig. 3.

The parts 1 A may be made of castmetal and will be provided at the endswith angular notches and flanges a for receiving a square boss (2, whichcarries the gas inlet elbow pipe F. Both ends of the casing may havethis construction. By means of the notches and square boss the partsA, Ama be accurately centered and then the bolt holes drilled in the flangesof both parts. The casing is supported on legs a. The gas measuring drumB and air measuring drum C are secured to a center shaft 1), the end ofwhich at the gas inlet end is provided with a pivot point d, while theopposite end is provided with a socket, into which extends the pointedend of a set screw '0 in the elbow pipe H. The pivot d enters a socketin the elbow pipe F. The drums are thus pivotally supported, to turnwith the least possible friction. Both of the drums have outer end headsforming respectively the gas chamber 72 and the air chamber 0. The drumsare spaced apart at their adjacent inner ends to form a gas and airmixing chamber 9, into which streams of gas and air are discharged fromthe five measuring compartments of each drum. he head of the gas drumBhas an inwardly turned tubular extension or collar of larger diameterthan the elbow pipe F, so as to leave an annular water seal space 70around said pipe. This tubular projection c' and seal 71: preventgas,which might pass along the head, from escaping into the outer cas-- Asimilar tubular extension Z may be EH1 W 100; g SECC-SSlVB .E

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The operation of the gas and air mixing meter is practically automatic,it being only necessary, after connection to the gas service pipe hasbeen made, to open the valve to the burner, when the gas will flow intothe chamber 5 and thencethrough openings 0 into any two measuring inletopening 0 and a narrower discharge opening p into the mixing chamber 9.Owing to the tact that the measuring compartments in the gas drum and inthe air drum are of substantially the same shape andof uniformproportions, one to the other, they will deliver currents of gas and airat the same velocity and pressure, so that they will form anintimate'xand homogeneous mixture in the exact pro ortionsin chamber g,to cause complete andpertectcombustion at the burners. Since all thecarbonaceous matter and hydrogen in the gas is consumed reason of therebeing present and mixed "h the necessaryproportion of oxyhigh flametemperature is produced at economy is tt'ectecl in the use of fuel.

- abovodescribed construction and as shown in the idrawing it will beunderstood that the screw;mea; suring compartments of the gas andairdrums have contracted inlet 11* d outlet openings,

compartments 4.0 which are open above the water line, The currents ofgas now impinge on the driving planes a or diverging walls of thecompartment, thereby. causing the drum to revolve and discharge gas intothe mixing chamber The air drum will be simultaneously revolved, causingair to be measured and discharged into mixing chamber g. The successivecurrents of gas and air at the same velocity are uniformly mixed inchamber 9 and passed therefrom to the burners.

The mixing meter, as above described and substantially as shown in thedrawings, has been constructed and put into practical operation withentirely satisfactory results.

Having thus fully described my invention, what I claim as new,

with diverging walls and of an increaslng cross area from the inletopenings toward the middle portions, and converging walls beyond themiddle portions to the contracted outlet openings, whereby the currentsof inflowing gas in the drum will impinge with the greatest pressure andetliciency upon the diverging walls of any two compartments open abovethe water line for causing the drum to re-- volve.

By constructing the helical vanes of the gas drum of such length thateach will encircle approximately four-fifths of the circumference of thedrum, every measuring compartment, which at one time is open to the gaschamber at the receiving end, will at the same time and desire to secureby Letters Patent, is:

1. In a gas and air-mixing meter, the gas drum mounted on an axle anddivided by helical vanes into screw measuring compartments havingcontracted inlet and outlet openings, and diverging walls, and anincreasing cross area from the inlet openings toward the middle portion,and converging walls beyond the middle tothe contracted outlet opening,whereby the currents of inflowing gas, under pressure, will impinge withthe greatest pressure upon the diverging walls of any two compartmentsopen above the water line and cause the drum to revolve, substantiallyas described.

2. In a gas and air-mixing meter, the gas drum mounted on an axle anddivided by helical vanes into screw-measuring compartments havingcontracted inlet and outlet openings, the vanes diverging and thecompartments increasingin cross area from the inlet openings toward themiddle portion, and said vanes converging beyond the middlc to thecontracted outlet openings, the vanes also having sector-shaped planesof different pitch to the axle, and one or more planes of the steepestpitch being in the diverging portions of the vanes between the inlet andmiddle portions of each compartment, whereby the currents of inflowinggas will impigne'with the greatest pressure upon said planes of steepestpitch in any two compartments open above the water line and cause thedrum to revolve, substantially as described.

3. A gas and air-mixing meter comprisdrum and an air measuring drummounted on the same shaft or axle in a casing and having a mixingchainber between them, said drums' being constructed with helical vanesdividing them be sealed in the water at the discharging end of the drum,so that no gas can pass through when the drum is idle. The measuringcompartments of the air drum being sealed in the same manner no gas canpass through them and out through the elbow pipe to the external air.The mixing meter is, therefore, perfectly safe and reliable in use. Assoon as the valvein the delivery pipe leading to the burners is closed,the gas and air drums cease to revolve, and the gas as well as themixture of gas and'air present in the casing, is held in place ready forigniimmediate use and tion when the burner valve is again opened.

In practice the measuring drums are made of greater diameter than theirlength, and the casing is preferably made of a diameter equal ,app'roimately to one and half times its lengthnmTl1is feature or" constructionis i portant in. the gas drum, for the reason mat-the pressure of gas ismore efiective on the-driving planes in proportion to the radiaidistance at whichit is exerted or applied from the axlepr above thewater line in the casing.

mg a propelling gas eompartments, the e from the inlet openlclleportion, increasing i converge beyond the micleutlet openings,Whereiowing gas under pres the greatest pres alls in the gas drum, sameand the air drum, e of gas and air r ran proportions same velocity andchamber, substanmm, a drum on an axle with helical vanes r thecircumferential and which diverge one w. the inlet openings lti'n,forming screw ents of increasing cross converge beyond the press-u on Jon an axle in the roe-a ree any two compartments open above the Waterline and cause the drum to revolve.

5. In a gas and air-mixing meter, a casing of greater diameter than itslength for proviclmg a'cornparatively tall column of Water to preventleakage of gas and having inlet and outlet oaenings, a gas drum mountedcasing and divided. by helical vanes into screw-measuring compartmentshaving contracted inlet and outlet openings and of increasing cross areafrom the inlet openings toward the middle portions and of decreasingcross area beyond the middle to the outlet openings, whereby thecurrents of infiowing gas, under pres sure, will impinge with thegreatest pressure upon the diverging walls of any two compartments openabove the Water line and cause the drum to revolve, substantially asdescribed.

In testimony whereof I alfix signature in presence of two WitnessesGEORGE E. COTTRELL. Witnesses:

J AMES MOLINDEN, F. M. TOPPIN.

